JP2579453Y2 - LED light emitting needle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED light emitting hand used as a hand of an alarm clock or the like.

[0002]

2. Description of the Related Art Conventionally, as a light emitting element of a light emitting needle, there is a light emitting element using electroluminescence (EL).

[0003]

The EL is excellent as a light emitting element in that it has high luminance and emits elegant light.

[0004] However, EL has disadvantages such as short lifetime and very high cost, and therefore, there is a problem in terms of its useful life and lifetime in order to be adopted as a luminescent needle.

Accordingly, an object of the present invention is to provide a low-cost LED light emitting needle having excellent brightness and long life by employing a light emitting diode (hereinafter referred to as "LED") as a light emitting element.

[0006]

In order to achieve the above object, an LED light emitting needle according to the present invention comprises a needle body, a plurality of LEDs for emitting light from the needle body, and a power supply for supplying power to each LED. the lead frame consists of a sealing member having translucency <br/> resistance to seal the LED, the needle body includes a mounting portion for mounting the guide shaft, as well as extending integrally from the mounting portion A lead portion having an opening at the rear side and a recess having a through hole formed at a position facing each of the LEDs, wherein the lead frame includes a pair of conductor pieces extending to a position corresponding to the recess, A sliding contact piece integrally formed with the two conductor pieces at a position corresponding to the mounting portion, and one of the pair of conductor pieces has the LED
A bowl-shaped connecting piece on which the LED can be mounted is provided at a position corresponding to the LED, the LED is sealed by the sealing member, and the lead frame is integrated by connecting the needle body. Has been

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Example 1 As shown in FIGS. 1 and 2 , an LED light emitting needle 21 is formed of a needle body 22 formed by molding a synthetic resin made of an opaque material;
A plurality of LEDs 23 for emitting light from the needle body
, And lead frames 24 and 25 for supplying power to each LED 23... And a translucent sealing member 26 for sealing each LED 23. Each LE
D23 are connected to the lead frame 25 by a plurality of bonding wires 27 described later.

The needle main body 22 includes a disc-shaped mounting portion 22a for mounting to the pointer shaft 28, and a pointer portion 22c integrally extending from the mounting portion and provided with a concave portion 22b opening rearward. I have. A plurality of through holes 22d are formed in the recess 22b toward the front. Further, both peripheral walls 22e, 22e in the longitudinal direction of the concave portion 22b have the same thickness as the thickness of the mounting portion 22a, and the lead frame 24,
It is formed in a shape substantially matching the width of the 25 conductor pieces 24a, 25a.

[0009] Both peripheral walls 22e, 22e and mounting portion 22a
A plurality of welding projections 22f are formed on the lower end face of the base. The plurality of welding projections 22f are connected to the lead frames 24, 2.
5 are formed so as to be fitted and welded to welding holes 24d,. Mounting part 22
A through hole 22g is provided at the center of "a" so that the pointer shaft 28 can be mounted.

As shown in FIGS. 3 to 5 , the lead frame is formed by first punching out unnecessary portions Ta from a single conductive plate material T one by one by press working in order to form the lead frame. Paired lead frame 2
4, 25 are formed continuously in parallel. On both sides of the plate material T, there are formed feed holes Tb for press working and assembling the LED light emitting needles 21. The portions formed as the lead frames 24 and 25 are
are partially connected to the conductive plate material T via c, and can be mounted on an assembling apparatus or the like while being integrated with the conductive plate material.

The needle body 2 is attached to each of the lead frames 24 and 25.
2, conductor pieces 24a and 25a extending in opposition to the lower end surfaces of the peripheral walls 22e and 22e, bases 24b and 25b formed at positions corresponding to the lower surface of the mounting portion 22a, and the base 2
Power supply sliding contact pieces 24c, 24c, 25 which are formed by being bent from 4b, 25b in the direction opposite to the mounting portion 22a.
c and 25c are provided. Also, the conductor pieces 24a, 25
a and the bases 24b, 25b are provided with a plurality of welding holes 24d, ..., 25d, which fit into the welding projections 22f of the needle body 22.

The conductor piece 24a of one lead frame 24
On the side of the other lead frame 25 facing the conductor piece 25a, a bowl-shaped connection piece 24e is integrally provided so as to protrude. Each connection piece 24e has a circular outer periphery, a reflection treatment on the inner wall, and an opening facing the through hole 22d of the needle body 22. Connecting piece 24e
The inside is flattened at the bottom by drawing.

The conductor piece 25a of the other lead frame 25
Has a connection portion 25e left in a convex shape at an intermediate position where the connection pieces 24e are arranged in parallel.

An LED 23 is mounted on the bottom of each connection piece 24e using a conductive adhesive (not shown). L
Connection terminals are provided on the bottom and top of the ED23,
The bottom terminal is electrically connected to one lead frame 24 via a conductive adhesive, and the upper connection terminal 23 a is electrically connected to the other lead frame 25 via a bonding wire 27.

A potting material 26 made of a transparent epoxy resin as an example of a sealing member having a porosity is covered on the upper surface of the connecting piece 24e, and the LED 23 is fixed to the bottom portion in a sealed state. In this state, the needle body 22 is put on the upper surface (the surface on the opening side of the connection piece 24e), and the welding holes 24d.
5d are fitted with the welding projections 22f, a welding tool (not shown) that generates heat is pressed against the tip of the welding projection, and the tip of the welding projection 22f is melted and connected to the welding hole 24d. The lead frames 24 and 25 and the needle main body 22 are fixed. Thereafter, as shown by the imaginary line in FIG. 5 , the lead frames 24 and 25 are adjusted to the shape of the needle main body 22, and the joint portion Tc is cut to complete the LED light emitting needle 21. The cutting position of the connecting portion Tc is exaggerated, and the cutting position substantially overlaps the outer shape of the needle body 22 in the actual product.

The above attachment of the LED light emission needles 21 that the configuration pointer shaft 28 of the watch to face up the needle body 22, the circuit switch (not shown.) To turn on the sliding Dosehhen 24
c, 24c, 25c, and 25c, the conductor pieces 24a,
A current flows through the LED 25a, and each LED 23 is turned on. Light is emitted from each LED 23 from the surface excluding the overlapping portion of the bonding wire 27 and the bottom surface. The light emitted from the side of each LED 23 is reflected upward by the bowl-shaped side wall, and the bright light condensed from the through hole 22d is emitted in the form of dots in front of the LED light emitting needle 21.

Next, an outline of the manufacturing process of this embodiment will be described. First, the lead frame 24, 2
5 is formed by punching out an unnecessary portion Ta by press working. At this time, the lead frame 2 is
4 and 25 are maintained in an integrated state without being separated from the plate material T. Next, the LED 23 is mounted on the connection piece 24e of the lead frames 24, 25, and the LED 23 is electrically connected by the bonding wire 27. Furthermore, the LED 23 is covered with a potting material 26.
Is sealed. The potting material 26 is a paste-like transparent liquid, which is discharged in a fixed amount from a dispenser (not shown), and has a high viscosity when put on the LED 23. Become. This is placed in a furnace at a predetermined temperature (not shown) and cured by heating. The potting material 26 has almost the same mountain shape as that at room temperature even after temperature curing, and has a lens effect of expanding light emitted from the LED 23. Next, the needle main body 2 is placed on the upper surface of the conductive plate material T.
2 and the conductive plate material T and the needle body 22 are integrally joined by heat welding. Finally, the portion of the joint portion Tc is cut along the outer peripheral portion of the needle body 22, and the lead frame 2
4 and 25 are separated, and the LED light emitting needle 21 is completed.

As described above, the LED of this embodiment
Since the manufacture of the luminescent needle is performed in a state where the conductive plate material and the lead frame are integrated, the operation of each step is easy, and the manufacture is possible at a low cost.

In this embodiment, the needle main body is made opaque, and a through-hole is provided on the opposite surface of the LED so as to display in a dot form. The upper surface of the through-hole is subjected to light scattering treatment. By fitting the light diffusing plate, it is possible to emit light in a circular shape, and it is also possible to provide a variety of LED light emitting needles by a combination of colors of the light diffusing plate and a combination of colors of the LEDs.

[0020]

[Effect of the Invention] As described above, the present invention employs a low-cost and long-life LED as a light emitting element.
A low-cost, long-life luminescent needle can be manufactured. In addition, LED
A series of steps from the mounting of the lead frame on the lead frame to the welding of the needle body to the lead frame can be performed under the condition where a pair of lead frames are connected to the conductive plate material. A light emitting needle can be manufactured at low cost. Furthermore, since the needle body is configured to cover the top surface of the lead frame, it is possible to provide a through hole through which the light emitted from the LED passes on the top surface of the needle body. You can also have it. Also lead frame
A bowl-shaped connecting piece on which an LED can be mounted is provided on one of the pair of conductor pieces, and the LED mounted thereon is sealed with a sealing member.
The light emitted by the LED is in a position facing the LED.
LE with high brightness that can be focused on the through hole of the needle body
There is an effect that a D light emitting needle can be used.

[Brief description of the drawings]

1 is a positive plane view of the LED light emission needles in Example.

FIG. 2 is a cutaway side view of the same part .

FIG. 3 shows a state in which a pair of lead frames are connected to a conductive plate material.
FIG. 4 is a partial cross-sectional plan view showing a state where an LED is mounted under the state .

FIG. 4 is a side view of a partially cut-away cross section .

FIG. 5 shows the welding of the needle body to the lead frame
It is a top view showing the state where it is separated from .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 LED light-emitting needle 22 Needle main body 23 LED 24, 25 Lead frame 24a, 25a Conductor piece 24c, 25c Sliding contact piece 28 Pointer shaft 22a Attachment part 22b Depression 22c Pointer part 22d Through hole 24e Connection piece 26 Sealing member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-80995 (JP, A) JP-A-2-298818 (JP, A) JP-A 52-56744 (JP, U) JP-A 4-56784 49817 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G01D 13/28 G04B 19/30 G12B 11/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A needle body, a plurality of LEDs for emitting light from the needle body, a lead frame for supplying power to each LED, and a light-transmitting sealing portion for sealing the LED.
Consists of a timber, the needle body includes a mounting portion for mounting the guide shaft,
It extends integrally from this mounting part and opens rearward.
And a recess having a through hole at a position facing each of the LEDs.
Formed consists of a guide part are, the lead frame includes a conductor piece of a pair of stretching at positions corresponding to the concave portion, is formed integrally with the both the conductor pieces at the position corresponding to the mounting portion A sliding contact piece, and one of the pair of conductor pieces corresponds to each of the LEDs.
A bowl-shaped connecting piece on which this LED can be mounted is
The LED light emitting needle is characterized in that the LED is sealed by the sealing member, and the lead frame is integrated by connecting the needle body .